A common Hebrew word is "shalom," which is Hebrew for peace, and is used to say both "hello" and "goodbye." A common Yiddish word is "glitch," which means "slip," "skate" or "nosedive," and has become a common American term for error.
Some common Jewish words are in Yiddish, while others are in Hebrew.
"Meshugah" is a common Hebrew word that means crazy person, and is used as a mild insult. "Goy" is a Hebrew word for anyone who isn't Jewish. It can also be used as an adjective in the form of "goyish." This is used when a Jew does something that is typically considered a non-Jewish thing to do.
"Tuches" is a common Yiddish word that refers to the buttocks. A "shikse" is a Yiddish term for a young, attractive, non-Jewish female, while a "shagetz" is Yiddish for an unruly, possibly violent non-Jewish male. "Mazel Tov" literally means "good luck" in Yiddish, but it doesn't mean luck for the future; instead, it is more of a congratulatory saying for something fortuitous happening in the present moment. A "klutz" is a "block of wood" in Yiddish, but it has come to refer to someone who is awkward and clumsy. "Bubbe" is Yiddish for Grandmother, although the more affectionate term is "bubele."